Public Information Statement
Issued by NWS National HQ

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NOUS41 KWBC 261950
PNSWSH

Public Information Statement 16-27
National Weather Service Headquarters Washington DC
350 PM EDT Tue Jul 26 2016

To:  Subscribers:
  - NOAA Weather Wire Service
  - Emergency Managers Weather Information Network
  - NOAAPORT
  Other NWS partners and NWS employees

From:  Mark Tew
  Chief, Analysis and Mission Support Division

Subject:  Solicitation of comments on experimental National
  Digital Forecast database (NDFD) 3km Alaska Region
  (AR) Forecast Grids effective August 24, 2016

Effective August 24, 2016, at 1400 Coordinated Universal Time
(UTC), NWS is accepting comments until October 23, 2016,
regarding the experimental NDFD 3km Alaska Region (AR) Forecast
Grids.

The new experimental NDFD 3 km AR forecast grids will be made
available concurrent with the experimental NDFD 6km AR grids
becoming operational. For details, see TIN16-28 below:

http://www.nws.noaa.gov/os/notification/tin16-
28ak_oper_ndfdcca.htm

More details regarding the 3km experimental gridded forecast
grid elements are available in the Product Description Documents
(PDD) in the online catalog of NWS products and services.

 https://products.weather.gov/PDD/AK_ExperimentalNDFD_PDD.pdf

With this implementation, these forecasts will be available from
NDFD in the standard methods:

- Gridded Binary version 2 (GRIB2) files via Hypertext Transfer
 Protocol (HTTP) and File Transfer Protocol (FTP)
- eXtensible Markup Language (XML) via Simple Object Access
 Protocol (SOAP)
- Graphics via Web browser:

Experimental 3km graphics can be accessed at:

 http://digital.weather.gov

Users who pull NDFD elements in GRIB2 format via the Internet
may need to update their procedures and scripts to access these
elements.

The new 3km experimental forecast GRIB2 files will be available
online at:

ftp://tgftp.nws.noaa.gov/SL.us008001/ST.expr/DF.gr2/DC.ndfd/AR.a
laska/
and
http://weather.noaa.gov/pub/SL.us008001/ST.expr/DF.gr2/DC.ndfd/A
R.alaska/

Partners and users who use the NDFD in XML via web service or
the online graphical NDFD images can use the same methods they
currently use to acquire these elements.

More information about accessing and using NDFD elements is
online at:

 http://ndfd.weather.gov/technical.htm

Comments on the new experimental 3km grids will be accepted
through October 23, 2016, via electronic survey at the following
link:

 www.nws.noaa.gov/survey/nws-survey.php?code=AR3KMNDFDGRIDS

Feedback will be evaluated and a decision will be made to extend
the comment period, discontinue the experimental 3km grids, or
transition to operational.

If August 24, 2016, is a critical weather day, this
implementation may be postponed. Partners and users will be
notified of that decision via a Technical Implementation Notice
as far in advance as possible.

For general questions regarding NDFD data, please email:

 nws.ndfd@noaa.gov

For technical questions regarding NDFD data, please contact:

 David Ruth
 Chief, Digital Forecast Services Branch
 NOAA/NWS Office of Science and Technology Integration
 Silver Spring, Maryland 20910
 David.Ruth@noaa.gov

For questions regarding this notice, please contact:

 Andy Horvitz
 National Weather Service
 Analyze, Forecast and Support Office
 Silver Spring, Maryland 20910
 Andy.Horvitz@noaa.gov

Public Information Statements specifically related to
NDFD are online at:

 http://www.weather.gov/ndfd/tins.htm

National Public Information Statements are online at:

 http://www.weather.gov/os/notif.htm



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